Ideal Gas Law Practice Problems with Density

Which of the following variables can be determined using the ideal gas law equation PV=nRT?

• Pressure, Volume, Moles, and Temperature

• Density, Molar Mass, Pressure, and Temperature

• Mass, Volume, Moles, and Density

• Pressure, Molar Mass, Temperature, and Volume

What is the alternative form of the ideal gas law used to calculate the density (D) of a gas?

• D = nRT / PV

• D = PM / RT

• D = RT / PM

• D = PV / nRT

To use temperature in the ideal gas law, how must a Celsius temperature be converted to Kelvin?

• Subtract 273 from the Celsius temperature.

• Multiply the Celsius temperature by 273.

• Add 273 to the Celsius temperature.

• Divide the Celsius temperature by 273.

What is the conversion factor used to change pressure from millimeters of mercury (mmHg) to atmospheres (atm)?

• 1 atm = 101.3 kPa

• 1 atm = 760 mmHg

• 1 atm = 14.7 psi

• 1 atm = 1000 mmHg

What is the density of sulfur dioxide (SO2) gas at a pressure of 932 mmHg and a temperature of 65°C? (Molar mass of SO2 = 64.1 g/mol, R = 0.0821 L·atm/(K·mol))

• 2.84 g/L

• 1.42 g/L

• 5.68 g/L

• 0.71 g/L

What are the standard temperature and pressure (STP) conditions for gases?

• 25°C and 1 atm

• 0°C and 1 atm

• 0 K and 1 atm

• 273°C and 760 mmHg

A gas has a density of 3.01 g/L at Standard Temperature and Pressure (STP). What is its molar mass? (R = 0.0821 L·atm/(K·mol))

• 33.7 g/mol

• 67.5 g/mol

• 101.3 g/mol

• 135.0 g/mol

Which of the following substitutions is crucial for transforming the ideal gas law (PV = nRT) into its density form (D = PM/RT)?

• Substituting P = F/A (Force/Area)

• Substituting n = m/M (mass/molar mass) and D = m/V (mass/volume)

• Substituting V = nRT/P

• Substituting R = PV/nT